Malicious PDF — malware analysis report

Static analysis result for SHA-256 216656eb8f0e5f5b…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 20:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5cadda2a914f36019edc7b7aeb36751d SHA-1: 6a375ea758a3e78dbbe07179ecf8d6d90d2605e3 SHA-256: 216656eb8f0e5f5b683a07a4c7bc1b0d70c44cc70c17fd3af6c552e78ff9edca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or domains with suspicious naming conventions, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=deep+sea+7320+datasheet PDF link annotation
    • http://gatofupimekow.mywebcommunity.org/academic_writing_and_presentation_skills.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/58950736159.pdfIn PDF document text
    • http://discount50.pro/gawazolutotopanapokedw71p.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/organic_chemistry_formulas_download.pdfIn PDF document text
    • http://atomyimperial.ru/application_letter_for_teacher_fresh_graduate_in_private_schoolknfnl.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/dfifjgg/gixawesa.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/pyEfgi9/primary_school_teacher_appointment_letter_sample.pdfIn PDF document text
    • http://italia-doc.fun/what_is_product_model_of_curriculumkhlk8.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/ijghheY/modern_combat_5_esports_fps_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/hhiceje/guide_d_utilisation_wordpress_en_franais.pdfIn PDF document text
    • http://hesap-al-sat.com/definicion_de_las_artes_plsticas4duvr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_9a0363c6c5c7498b827901725e5a2f92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/advantages_and_disadvantages_of_nuclear_power_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/bilaspur_university_private_exam_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06324ba-fcae-4f6e-b332-fe7fe04e79ec/i_am_number_four_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/19545698783.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_d1982117ca274e289aca7c952dd17f24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cutting_corners_shane_eagle_free.pdfIn PDF document text
    • http://jujobope.atwebpages.com/41581741571.pdfIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_bcdc51b0946841c0831cad69d93a8c3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29578be1-3d92-43d1-8923-8f6dddac0691/how_to_remove_a_jammed_nail_from_a_porter_cable_nail_gun.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_6c37611b3ae64a85959b46e51b9218ec.pdf?index=trueIn PDF document text
    • http://dazejifudora.onlinewebshop.net/20460323834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9aa484-c33c-423f-8a9b-f037b4e7e809/fios_router_g3100_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/dafinuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce7b9f6-dcd1-481f-8f76-3d6452bcb2da/44666918685.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 5436 bytes
SHA-256: 86f09e366350a63936592381048536bc1a8da7aea9783f8808633ca7a774ad99
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 11384 bytes
SHA-256: d9df107bc184be78a467b65f14d623c9e85e3c35f6918d79394edce9411766ea